Power Transfer Capability Enhancement with UPFC under Circumstances of Uncertain Power Flow Pattern

UPFC is expected to be the best device in enhancing power transfer capability because it can provide efficient controllability of power flow with a comparably small inverter capacity. System control devices are required to secure or improve transfer capability in the circumstances that the network power flow is subject to change with uncertainty due to increased power transactions in a power market. To clarify the effect of UPFC in such situation, it is needed to evaluate the robustness regarding system stabilization when various network flow patterns appear in a power system. This paper quantitatively presents point to point stability ATC increments with UPFC for various power transfer patterns of a system model. The results prove that the combined installation of UPFC and generator PSS can be a robust measure to enhance stability ATC for every power transfer patterns